Phys. Rev. Lett. 99, 162502 (2007) [4 pages]Crystal Blocking Measurements of the Time Delay of Fission Induced by 32S, 48Ti, and 58Ni Bombardment of WReceived 30 March 2007; revised 14 July 2007; published 15 October 2007 The time delay in fission induced by bombardment of W with 180 MeV 32S, 240–255 MeV 48Ti, and 315–375 MeV 58Ni has been measured by observation of crystal blocking. There is a clear narrowing and a small increase in the minimum yield of the angular dips for fission compared with scaled dips for elastically scattered ions. This is interpreted as a fission delay of about 2 as, only weakly dependent on energy and atomic number. The delay is longer by 1 to 2 orders of magnitude than obtained from standard interpretations of measurements of prescission neutrons and giant-dipole-resonance gamma rays and from calculations of the nuclear dynamics in heavy-ion reactions. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.162502
DOI:
10.1103/PhysRevLett.99.162502
PACS:
24.75.+i, 25.70.Jj, 61.85.+p
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